What are the four basic welding positions?
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Description : Describe the basic SHA operation with the help of its four mode specifications.

Answer : Sample-and-hold amplifier (SHA) is a unity gain amplifier with a mode control switch where the input of the amplifier is connected to a time-varying signal. A trigger pulse at the mode control switch ... but other forms, such as optical and mechanical forms, are possible. Also denoted S/H.

Description : What are the different types of welding?

Description : What is undercut defect in welding?

Description : For arc welding current range is usually  (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A

Answer : For arc welding current range is usually 100 to 350 A

Description : Spot welding is used for (1) Thin metal (3) Castings only (2) Rough and irregular surface (4) Thick sections

Answer : Spot welding is used for Thin metal